Pioneer Exclusive F3
(1976 - 1979)

Unfortunately... there isn't much I can tell you about this extra-extra-extra rare big beautiful high-end FM tuner which still bore a 4-Channel Multiplex output in view of (potential) Dolby-FM broadcasts.

Pioneer advertised about it very little and it seems only one catalog displayed it well, if with little technical description (> above, 1978).
I couldn't find any test or quick reviews in any of my japanese magazines either but managed to pull a summer 1976 japanese Stereo Sound ad (> below) that shows the complete inside of this rare FM machine.

It just seems the Exclusive F3 shares the very same 7-gang varicap assembly with the also extra-rare, also Japan-only and also magnificent F-26. The rest is... bigger !

Since we all have the same july 1978 catalog, you can find the basic technical description at Mr Nisi's, alongwith the specifications.